Pipe tongs



y 1951 c. L. COSHOW 7 2,552,521

.' PIPE TONGS Filed July 51, 1946 2 Sheets-Sheet 1 I INVEZNTOR. \1 &6 2221.6 wizaw,

ATTD RN EYS y 1951 c. pcosnow 2,552,521

' PIPE TONGS V i Filed July 31 1946 2 Sheets-Sheet 2 Y INVENTOR. d/zemzrl. Cwfiow,

ATTEI RN EYS Patented May 15, 1951 UNITED STATES PATEN OFFICE 3 Claims.

This invention relates to improvements in rotary drill pipe tongs thatare especially adapted to break tool joints or casing, while being run or pulled on a drilling or producing well.

The principal object of the invention is to provide a device of this character that is positive in action, simple and highly efficient in accuracy and construction, unique in operation, strong, durable, reliable and efiicient in use and can not easily get out of order.

Another object of the invention is to provide a device which may be easily used to make up and run drill pipe and casing by eliminating all ropes and chains that are conventionally used in spinning drill pipe, thereby providing a device that is high in safety factors, since the extremely hazardous procedure of handling the rope or chain by a workman is eliminated as well as the necessity of having extra tong heads to change from one size of pipe to another.

With the above and other objects in view, the invention consists of the novel details of construction, arrangement and combination of parts more fully hereinafter described, claimed and illustrated in the accompanying drawings in which:

Figure 1 is an elevational view of an embodiment of the invention;

Figure 2 is a side view thereof;

Figure 3 is an end view thereof;

Figure 4 is a sectional view on the line 44 of Figure 3;

Figure 5 is a sectional view on the line 55 of Figure 2;

Figure 6 is a sectional view on the line 66 of Figure 3; and

Figure 7 is a perspective view of the removable shoe member.

Referring more in detail to the drawings, the reference numeral ll designates the pipe tongs which comprise the elongated handle member l2 having the arcuate shaped pipe section gripping shoe member 14 detachably attached to the end of the handle member by means of bolts [6. A tongue I8 on the shoe member l4 properly seats the shoe member on the handle member and the gripping face of the shoe member [4 is serrated or roughened as at l9.

Along the medial line of the handle member l2 adjacent the end thereof on which the shoe member M is deltachabhz connected are the pivot pins 22 which are in spaced parallel relation with each other and on which are pivotally and slidably mounted the tong jaw members 24 and 26 respectively, by means of their bifurcated ends 2.8. and the pins 22 are mounted in elongated slots 29 in the handle member. The end of the handle member l2 extends beyond the pivot pins 22 so that the shoe member I4 is positioned between the jaw members 24 and 26.

The free ends of the jaw members meet in alignment at 30, and adjacent their meeting point, jaw member 26 is provided with an upstanding apertured car 32 to pivotally mount the bifurcated end 3 of the latch dog 38 which is apertured to engage the lip 38 formed on the end of the jaw member 2 3.

On the inner face of the jaw members in opposed relation to the shoe member M in seats provided therefor, are mounted rollers 40 by means of pins 42 and these rollers and shoe member M are adapted to engage the casing 44 as shown in Figure l.

Rotatably mounted on an axle 45 supported by the handle member 12 laterally of a side face thereof near the shoe supporting end thereof and intermediate the pins 22 and shoe member M in a roughened surface drum 50 having rigidly secured to its outer surface by means of bolts 48, the spool 46. The drum 5!] houses the spring 52 which is connected to the axle 435 and the inner surface of the drum 50 at 5| and 5| and causes the rewinding of the cable 54 on the spool after the operation of the tongs. The drum is provided with a roughened surface 56 which is adapted to engage a joint on the casing 44. The spool is provided with roller bearings 58 for the free rotation thereof on the axle 45 which is mounted in the bore 60 in the handle member [2 and fixed in the forked end 62 of the angular lever arm 64 by pins 66 and the lever arm 64 follows the conformation of the jaw member 24 and is pro vided on the forward end thereof with an eye 68 which engages the jaw member 24 adjacent its meeting point with the jaw member 26, the lever 64 being pivotally mounted on the jaw 24 at a location intermediate the ends of the lever arm and the jaw member 24 by means of the pivot pin 10.

The upper end of the handle member is provided with an arcuate shaped recess 12 which receives one end of the cable 14 which is connected to the cat head for tonging the pipe tight, and the cable is connected to the cable 14 in proper relation, as at 16. The recess 12 is closed by a plate '18 mounted thereover, which is secured to the handle member 12 by bolts 80, and an eye or staple 82 adjacent the recess is provided for connection to a spring not shown that will pull the ton back in position for another stroke.

' drill pipe or casing, forcing the latter to come into contact with the rollers 40 on the jaw members 24 and 26. Then by pulling the cable 54 which causes the spool 46 to rotate, the drill pipe or casingi'is forced into a snug position against rollers 45', such movement being accomplished by means of the pins 22 mounted in the elone gated slots 23. Then when the pull on the lever is removed the housing 58 will move out of i'en-L-a gagement with the drill pipe or casing so that when pressure is released on thepable; the spring 52 winds the cable back on the spoohreadyifori" another stroke when the lever 64 has again been moved on its pivot to return the housing into engagement with the drillipipe or casing. When engagementeof thesurface 56 Withthe drill pipe creasing-will no longer rotatethe drill-pipe orcasing 1 thejaws may be latched in" closed" posi tion, whereby the-shoe member l4 grips the tool joint and thenvsufiicienti pressure is exerted on thelhan'dlea to make a perfect joint. Cable 54" may be pulled asmany timesas necessary to force: the-pipe; or casing into a snug position againstrrollersn lfifor tonging, thereby making aspee'dier, fasternand safer working-drill pipe and casing tong. The drum EB'Lmay be removed fontresharpening of. itsgsurface' 56, and the shoe member ML-is removable for replacementofvarious sizeishoe members according to the pipe being tonged.

Itisbelieved thatthe operation and construction of the invention will be apparent to :those skilled .in the art, and it is to be understood that while the descriptionandvuse oflthe: invention has only. beendescribed as. being used for the purpose of making and. breaking a drill pipe and casing, it can be applied to makingand breaking of any kind of pipe being run in oroutof a 4 claimed as new and desired to be secured by Letters Patent is:

1. A pipe tong comprising an elongated handle member, a pair of jaw members independently, pivotally and slidably mounted on the handle member, near one end thereof, pipe section gripping means including a roughened shoe detachably attached to an end of the handle member,rbetween the jaw members, and a pair of rollers mounted-- one on each jaw member, and pipe jointgripping means including a roughened surface drum mounted laterally of a side face or the handle member on an axle supported by th'e handle member near the shoe-supporting end thereof, meansfor moving the drum into or out ofengagement' with the pipe joint, means for rotatings'the drum} and means for latching the jaw members in closed position about the pipe section.

2. The pipe tongs of claim 1, wherein the slidable connection for-each jaw member to the handlemember includes an elongated slot in: the

drum includes a tensioned coil spring within the drum, whose ends are secured to the drum a-XIe and'inner surface-of" the drum, respectively 3. The pipe tongsof claim 2, wherein the coil springwithin' the drum is tensioned byp'ull'on a-rope wound on a spool which is supported on the'drum' axleand rigi'd'ly secured to the drum.

CHESTER LEON COSHOW.

REFERENCE S CITED The following references are of record in the file) of this patent:

drillingor producing wellor on pipe beingilaid horizontally-on the ground.

Having thus described the invention whatis UNITED STATES PATENTS Number Name Date 1,702,822 Ferguson Feb. 19, 1929 1,888;7'-I0- Posey Nov. 22, 1932 2 ,302,249 Penfield Nov. 17, 1942" 23111225 Grable' Feb. 16, 19 43 

